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All filters and pumps need to be cleaned regularly or they can do this. Also overfeeding , OVERSTOCKING , low flow and water source. Not sure i would trust the LFS water myself , just because you test the water before it goes in doesnt mean its good , as tap water or improperly filtered water only shows high readings after time ,collects slowly and before you know it you have high readings.
Also a SB that isnt properly sifted and if you have alot of LR in the bottom back that cant get flow then uneaten food and waste can collect and cause this.
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Lance H.
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